Free User and Terminal Server?

Free User and Terminal Server?

I'm setting up a Debian 10 Linux machine for my son and his five children. I would like to use the Terminal Server feature of TeamViewer (cf. Remote Control Manual page 103) so that they can each interact with me from their own personal accounts on that machine.

But I'm concerned that this might be mistaken for commercial use. What do I need to do to avoid giving that mistaken impression?